[OZAPRS] Re: Packable Tracker [SEC=UNCLASSIFIED]

[Howard, Bruce MR]

UNCLASSIFIED

Guys,

Don't know why you don't use a hand held with TNC built-in like Kenwood
TH-D7A, GPS head and a small battery pack to pwr the GPS. All in All can
be carried on belt and in top pocket, or if on a bike mount on helmet.

Hope this helps,


Rgds



Bruce


Bruce Howard  CISSP CISA OPST
Security Accreditation Manager
Contractor to Defence
JCTC-SSS Development Office
F1-2-020
26-28 Fairfairn Avenue
Canberra 2600
Tel: +61 (02) 6127 1220
Mobile: 0428974848
Email: bruce.howard at defence.gov.au

-----Original Message-----
From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
Behalf Of Dave Ingram
Sent: Thursday, 8 May 2008 18:31
To: vk7arn at bigpond.com; Australian APRS Users
Subject: Re: [OZAPRS] Re: Packable Tracker

vk7arn wrote:
> I've put some pictures and notes on the APRS BakPak tracker here 
> http://tas.wicen.org.au/APRS/aprs_bakpac.html.  Seems to work without 
> RF feedback OK now at 4W.  Thanks for the contributions, some of which

> (those suited to the concept) I'll incorporate.

For those that are interested, I did something similar last year when I
bought an OpenTracker 1+. I haven't replied until now due to computer
problems, but it sounds like people are on the same track as I was.

I use 4x AA batteries to run the tracker and Deluo SirfStar III GPS
(which is so sensitive it works well from inside the case), and the
Puxing PX-777 runs off its own Lithium Ion battery.

To avoid RF problems I put a ferrite choke on the microphone lead at the
tracker end.

The description of what I did is at:
	http://ingramtech.com/?p=13
Some photos are at:
	http://ingramtech.com/photos/main.php?g2_itemId=727

It works quite well with a 1m whip antenna on the bike, but still has a
little difficulty around the hills/bumps in inner-west Brisbane. If I
put the tracker onto my colinear it hits the VK4OG igate about 40km away
with no difficulty at 5W.

I would like to make something smaller, but that would involve the
OT1smd and a GPS module, all on one board that fits into an empty
battery holder on the PX777. An external LiIon pack would then run the
whole lot.


Regards,
	David.
--
David Ingram (VK4TDI)
Real email: dave at ingramtech dot com
Brisbane, Queensland, Australia
http://www.ingramtech.com/
MGRS: 56J MQ 991583    Maidenhead Grid Square: QG62lm
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